In February, the U.S. military flipped the switch on its largest solar project at Davis-Monthan Air Force Base in Tucson, Arizona. Covering 170 acres at two locations on the base, the 16.4 MW PV project is expected to provide up to 35% of the base’s electricity and save the base up to $500,000 a year.

Six other bases plan to achieve net-zero energy by 2020 as part of the Army Net-Zero Energy Initiative. Fort Bliss, Texas, and Fort Carson, Colorado, are striving to be net-zero energy, net-zero water, and net-zero waste by 2020. The Oregon National Guard is also working on net-zero energy plans for all of the state’s installations.